摘要
The directed and elliptic flow in collisions of ^(112)Sn+^(112)Sn at energies from 35 to 90 MeV/nucleon are studied in an isospin-dependent quantum molecule dynamics model.With increasing incident energy,the directed flow rises from negative to positive.Its magnitude depends on the nuclear equation of state(EOS).However,the elliptic flow decreases with increasing incident energy and its magnitude is not very sensible to EOS.Systematic studies of the impact parameter dependence and the cluster mass dependence are also performed.The study of directed flow at intermediate energies thus provides a means of extracting the information on the nuclear equation of state.
基金
Supported by the National Natural Science Foundation of China under Grant No.19705012
the National Natural Foundation for Distinguished Young Scholars under Science Grant No.19725521
Shanghai Science and Technology Development Funds under Grant No.97QA14038
Special Foundation of the President of the Chinese Academy of Sciences and Major State Basic Research Development Program under Contract No.G200077400.
